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Message: <blockquote data-quote="tunkertrigger" data-source="post: 28884" data-attributes="member: 10761">I posted before on 5/12/25 about the purchase of my 2018 'Nox Premiere diesel. It has driven well since then but about 10 days ago the problems began. First, engine light came on andI determined with my Tom Swift Code breaker that I had a P2457 warning. This has to do with EGR system. Since then my mpg has begun to decline. At purchase, I got 40-41 mpg. Now,it's down to no better than 36 mpg. It is almost due for a 5k service so am hoping for improvement. If not, that's not good enough for a diesel with fuel prices the way they are in my area.It will be sayanora sucker! Really thinking about a Honda Ridgeline. Drove one and was impressed. Oh BTW, dealer was no help. Not impressed and I have owned many Chevies. This one is not even American made!</blockquote>